2023 can be done online but not e-filed since the original was not done in Turbotax. 2022 and prior can only be done with desktop versions and cannot be e-filed.
since the original return was not done in Turbotax you would have to recreate it line by line schedule by schedule. form by form so it exactly matches what was filed. you save the return and then reopen the app. there should be a blue link to amend to click on to start the amending process.
If it was the preparer that messed up in doing the original, they should do the amendment for free. if they refuse, you could report them to the BBB and if a CPA your state CPA society. you may also be able to file a complaint with the iRS.
https://www.irs.gov/tax-professionals/make-a-complaint-about-a-tax-return-preparer#:~:text=Read%20an...
